Adding docs around the Subnet Available collector and analyzer

[CpuID]

Self explanatory.

Should be merged with a release of replicatedhq/troubleshoot#1004 (with the version number it was introduced?)

[paigecalvert]

Holding on the docs review until Evans has a chance to review, but wanted to ask if this new topic might also need to be manually added to the TOC? Asking because I did not see it in the TOC in the Netlify preview (I think it's supposed to be in this section): https://deploy-preview-473--troubleshoot-sh.netlify.app/docs/host-collect-analyze/overview/

[banjoh]

Content LGTM. We'll want to wait for the feature to be released first before merging though

[jonquil2002]

@CpuID Looks good! I just made some minor edits to your content to reflect our style guide.

Two things I think are missing:

• It looks like it should be listed and linked to from the All Host Collectors page. https://deploy-preview-473--troubleshoot-sh.netlify.app/docs/host-collect-analyze/all/
• It seems to be missing from the TOC on the left. It should be added alphabetically, though there is at least one mistake in that TOC.

Lmk when you're ready for a final review.

[CpuID]

I just made some minor edits to your content to reflect our style guide.

thanks @jonquil2002 :)

[CpuID]

I'll sort out getting this on the TOC, I missed that one 👍

[jonquil2002]

@CpuID @banjoh lmk when you're ready for a final docs review! :)

[CpuID]

Sorted out the TOC + a few other outstanding items mentioned above, thanks @jonquil2002 @paigecalvert

This is ready to merge once replicatedhq/troubleshoot#1004 is released 👍

[jonquil2002]

lgtm

[banjoh]

All good!

[CpuID]

heads up: replicatedhq/troubleshoot#1004 is merged but not released yet

holding on a merge of this PR until it's released

[CpuID]

Released, 0.59.0